diff --git a/.travis.yml b/.travis.yml
index f9cb021..df3eef4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,10 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.2.3
-  - 2.3.1
-  - 2.4.1
+  - 2.3.3
+  - 2.4.2
+  - 2.5.3
+  - 2.6.0
 
 script: bundle exec rspec spec
 before_install:
diff --git a/airborne.gemspec b/airborne.gemspec
index 1750e41..dcb6f62 100644
--- a/airborne.gemspec
+++ b/airborne.gemspec
@@ -10,9 +10,9 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.files = `git ls-files`.split("\n")
   s.license     = 'MIT'
-  s.add_runtime_dependency 'rspec', '~> 3.1'
-  s.add_runtime_dependency 'rest-client', '< 3.0', '>= 1.7.3'
-  s.add_runtime_dependency 'rack-test', '~> 0.6', '>= 0.6.2'
+  s.add_runtime_dependency 'rspec', '~> 3.8'
+  s.add_runtime_dependency 'rest-client', '< 3.0', '>= 2.0.2'
+  s.add_runtime_dependency 'rack-test', '< 2.0', '>= 1.1.0'
   s.add_runtime_dependency 'rack'
   s.add_runtime_dependency 'activesupport'
   s.add_development_dependency 'webmock', '~> 0'